Basic Descriptions:
* Dark red
* Deep red
* Burgundy (often used interchangeably with maroon)
More Descriptive Words:
* Rich
* Warm
* Sombre
* Sophisticated
* Elegant
* Dramatic
* Earthy
* Subdued
* Dusky
* Wine-colored
* Mulberry
* Mahogany
Literary/Figurative:
* Crimson-tinged
* Blood-red (if particularly dark and intense)
* The color of twilight
* The color of autumn leaves
The best words to describe maroon will depend on the specific shade and the context in which you are using it.